FR2622982A1 - PORTABLE MONOCULAR - Google Patents

Abstract

A monocular comprises an elongated body in two parts (2, 3) at one end of which is fixed an eyepiece (1). At its other end, said body encloses two biconvex lenses (4, 4') of equal power arranged in grooves (5, 5'). The ratio of the distance (A) between the first lens (4) and the second lens (4') and the distance (B) between the second lens (4') and the eyepiece (1) is approximately 1/4. The device, which provides a high magnification, is particularly applicable to the observation of insects in agriculture.

Description

The present invention relates to a monocular for close observation. This monocular is portable, it is a lightweight optical instrument, easily transportable, with a high magnification (about 18 x). I1 allows, better than a strong magnifying glass or a jeweler's ocular (instruments too short and difficult to accommodate the eye), without arriving at the binocular, to observe objects not visible to the naked eye and to fix on a specific point, in particular in agriculture, on an insect larva (for its identification and its stage of development, etc ..., best times of treatment).

The present invention will be better understood on reading the description hereafter of a preferred embodiment with reference to the appended drawings in which FIG. 1 represents an exploded view of the main constituent elements, FIG. 2 represents a longitudinal section of FIG. mounted object and Figure 3 shows a cross section of the object.

This monocular, which can be made of plastic, is composed of a cylinder, an eyecup and two biconvex lenses.

The cylinder is composed of 2 parts (2,3). It has two spherical notches on its inner face, disposed at the end opposite the eyepiece. In a typical example, the cylinder is 67 mm in length, 17 mm in aperture and 22 mm in diameter. The first notch is 2 mm from the opening of the cylinder and the second is 14 mm from the first!. The two lenses biconvexesi 'a power of 33 diopters, 9 x and 18 mm in diameter are inserted into these notches. Opposite the lenses - a distance of 52 mm (B) comes to screw or screw on the cylinder an eyecup.

The monocular has the distinction of being able to disassemble very quickly. It is necessary to disengage or unscrew the eyelet (1) of the cylinder which is formed of 2 elements (2 and 3): These two elements can be fixed with each other thanks to a system made by any appropriate means (here a closure system male - female).

For better holding in the hand, the monocu lar can be provided with grooves on its outer face.

Claims (3)

<U> CLAIMS </ U> 1) Monocular for close observation, characterized in that it consists of a cylinder formed of 2 parts (2, 3) on an end of which is fixed an eyelet (1) and which has at its other end internally two biconvex lenses (4) arranged in such a way that the distance between them (A), determined by their powers and the distance from the second lens to the eyecup (B) is in a ratio A = about 1/4 B, these two lenses being held in grooves arranged inside the cylinder. 2) A monocular according to claim 1, characterized in that, for a magnification of about 18 x, it is composed of a cylinder 67 mm in length, 17 mm in aperture and 22 mm in diameter, 2 lenses biconvex 33 diopters, 9 x 18 mm in diameter, spaced 14 mm apart (A) and spaced apart at the aperture of 52 mm ('B). 3) A monocular according to claim 1 or 2, characterized in that the non-optical parts may be of plastic or any other light material.